features/bitrot: Introduce scrubber monitor thread

The patch does following changes.

 1. Introduce scrubber monitor thread.
 2. Move scrub status related APIs to separate file
    and make part of libbitrot library.

Problem:
     Earlier, each child of the scrubber was maintaining
the state machine and hence there was no way to track
the start and end time of scrubbing as each brick has
it's own start and end time. Also each brick was maintaining
it's own timer wheel instance. It was also not possible
to get scrubbed files count per session as we could not
get last child which finishes scrubbing to reset it to
zero.

Solution:
    Introduce scrubber monitor thread. It does following.

 1. Maintains the scrubber state machine. Earlier each
    child had it's own state machine. Now, only monitor
    maintains on behalf of all it's children.
 2. Maintains the timer wheel instance. Earlier each
    child had it's own timer wheel instance. Now, only
    monitor maintains on behalf of all it's children.

As a result, we can track the scrub statistics easily
and correctly.

Change-Id: Ic6e34ffa57984bd7a5ee81f4e263342bc1d9b302
BUG: 1329211
Signed-off-by: Kotresh HR <khiremat@redhat.com>
Reviewed-on: http://review.gluster.org/14044
Smoke: Gluster Build System <jenkins@build.gluster.com>
NetBSD-regression: NetBSD Build System <jenkins@build.gluster.org>
CentOS-regression: Gluster Build System <jenkins@build.gluster.com>
Reviewed-by: Venky Shankar <vshankar@redhat.com>

1 files changed, 17 insertions, 1 deletions

diff --git a/xlators/features/bit-rot/src/bitd/bit-rot-bitd-messages.h b/xlators/features/bit-rot/src/bitd/bit-rot-bitd-messages.h
index c0b83c6..c6b6a4a 100644
--- a/xlators/features/bit-rot/src/bitd/bit-rot-bitd-messages.h
+++ b/xlators/features/bit-rot/src/bitd/bit-rot-bitd-messages.h
@@ -40,7 +40,7 @@
  */
 
 #define GLFS_BITROT_BITD_BASE                   GLFS_MSGID_COMP_BITROT_BITD
-#define GLFS_BITROT_BITD_NUM_MESSAGES           53
+#define GLFS_BITROT_BITD_NUM_MESSAGES           55
 #define GLFS_MSGID_END                          (GLFS_BITROT_BITD_BASE + \
                                            GLFS_BITROT_BITD_NUM_MESSAGES + 1)
 /* Messaged with message IDs */
@@ -427,6 +427,22 @@
  *
  */
 /*------------*/
+#define BRB_MSG_SSM_FAILED                 (GLFS_BITROT_BITD_BASE + 54)
+/*!
+ * @messageid
+ * @diagnosis
+ * @recommendedaction
+ *
+ */
+/*------------*/
+#define BRB_MSG_SCRUB_WAIT_FAILED          (GLFS_BITROT_BITD_BASE + 55)
+/*!
+ * @messageid
+ * @diagnosis
+ * @recommendedaction
+ *
+ */
+/*------------*/
 
 #define glfs_msg_end_x GLFS_MSGID_END, "Invalid: End of messages"
 #endif /* !_BITROT_BITD_MESSAGES_H_ */